Power-actuated pneumatic tool



S. SEABULDT ANU H. C. BROWN.

POWER A1f\CTU.".`i'D PNEUMATIC TOOL.

AFILICA'HGN HLN) AUKLZ, 1919.

n iflifei Y .f .Y r

B. sEABoLnT AND H. c. nowN.V

POWER ACTUATED PNEUMATIC TOOL. K

APPLICATION FILED AUG2, I9I9.

Patented Jau. 3, 1922.

2 SHEETS-SHEET 2.

,mf SE ed. a Mw/ 3,1?

rra/PME W [Imran-.STATES PATENT oFFicE.

BEABOLDT AND HEBERT BROWN, 0F NEW YORK, N. Y., SIGNORE T0 B. GARIB'LDI, 0F BROOKLYN, N EW YORK.

romaorua'rsn rimuxa'ric roei' 1,402,727.V menu new mm Patenten Jan. 3,1922. application ma anni e, me. zum n. amm. To au wom'z't moy concern.' dnal section illustrating the pistonupoii the Be it known that we, Bam- Siianowr an completion of itiforward Astroke and further Hmmm- C.' Biiowii, citizens of the United illustrating means for limiting the force offst; residi at NewfYorlr, count of the plunger blow. r v t New ork, a State of New York, ave Fig. 4, is a similar 'ew illustrating the-60 'ointly invented -certain new and use ful' manner of further limitilng the'force of the awel-Actuated Pneumatic Tools, of which 4plunger blow. the following is a specification. f Fig. 5, isaview iii-tuensverse section taken The invention has relation to that clam of upon the line 5 of F 4.

device set forth in U. S. Patent No. 1,1 3,- Fim is a' similar view taken upon the 05 687. Practical experiencein the handling line of Fi 4, and of a toljof this character has demonstrate Figs. i and are respectively a-face view the l for certain improvemente, An and a .sideelevatione view ofthe Spacer e obictionab e feature has been that upon the shown in Fig. 4.

forward and return strokes of the piston the For the purpose of illustrating our in; 10

impm entsof 'these parts were` of -such ventionvqe have shown in the accompanyforoe m decided metallic sound was pr ing drawings-one forniA thereof which is at4 duced. One object of the; present invention gee t preferred by us, since the same hns is to overcome 'thisV defect by. roviding a ii lgound in, practice to give satisfactory power-actuated neumiitc too in which, and reliable results.

durin its norma working periods the float!- In the. drawing I designates a cylinder in' ing p un r and pistou are connected by a which operates a. piston42 and a floating pneumatic cushion. Another disadvantage of pluri r 3. The piston m'a be reciprocated said atented tool was that the same became in cy inder 1 by any suitab e power actuated '25 undu ylieated. Another object of the present device. As an exemplification of :in osera. 80

n. we

invention is'the provision of menus whereby tive embodiment of means to this e -continuous circulation of atmospheric nir have shown in the drawings an eccentric 4 mayi'be maintainedardund the contini-sleeve mounted upon a driven shaft 5 connect' A still f'iii'thcidisadvantage of said patented which eccentric and the iston is a ptmanu tool wasthe lac-kof positive means for deter- The shaft 5b may be riven 'oy any con- 85 mining n. proper graduation of the force of venient arrangement of wer mechanism. piston blows. It is a still further object of In practice the shaft is riven through the` the present inventionv to provide interinstrumentality of an electric motor and` chan lile devices for Eositivelv controlling flexible shutting. The piston 2 is provided the izi'gce of blow struc Ano er'commerat its outer -end with a longitudinally dis- 90 cial disadvanta for said patented tool was posed chamber 7 of a de' th equal to the the absence o a practical nozzle support throw of @centric 4, ports for lthe ingresewhich defect has been remedied in the presof air being provided in said chamber. The ent construction. floating plunger 3 is provided at its inner The invention consists o f the imgroveend withan extension 3 shaped and pro-98' ments hereinafter described and nallyf portioned for a sliding lit within the piston calmed. chamber during the tool operation`- The The nature, characteristic features and walls of c linder 1 are providedlwith ports scope of the invention will be morefully designate 8, 9 and 10. Surrounding, lin un erstood from the following description der 1, and Fixed to bari-el 17 as -by a i 've 100 teken in connection with the accompanying fit and adapted for longitudinal sli drawings forming part hereof, and in which: movement therealong, is a port control sleeve Fig. 1, is a longitudinal sectional view of 11. Iutcrposed between the outer end of a l emhgglyinguth'e'-principles of oui'insleeve 11 and the inner end ofthe nozzle or 5.0 vention't'hefamebeingillustrated in a-positool holder 12, which is fixed to cylinderl 1, 106

'.Fig', 2, is a similar view illustratin the to maintain tool-holder l2 and c nder 1 piston upon a partial completion of its forin the osition shown in F' 1.A outerward strolie. n wall osleeve 11 is provideitli a plural- Fig. 3, is n. fragmentary view in longituity of spaced annular grooves 15 which are mi tion oi ",.i'ptr, if,... is a coiled springl which .noi-man tends Q A l l 1,402,727

distributed nuhstuntiull throughout the length of said sleeve. hcs'e grooves ure u eonmnt columunieution with utmospln-.iic air by reasonfof air intake arts 16 provided barrel l?. Other ports 1li are provided m barrel 17 et its.I outer end. The port! i0 und i6' serve to permit of aixiutinuoue en'culutiou of latinos iheric nir around both control nleeve 1`l :mi cylinder 1 for cooling pui'- lmncs. 'l`he ports I6' have c further funetion in thnt when the sleeve ll is m tbe position shown in Fig. 1 the interior of cylinder I is freely open to atmen iheric air through purtn 8 und I6'. Under t ieee conditions reri rotation of the piston 2 doce not create milistuntiul mnnpnenion and suction so that the louting plimger remains idle. :W ith the shifting; forward of harrel i7 und sleeve il,

however; port H is closed by sleeve il so that v compris-:sion and suction operations take place in the cylinder by rteiprocution pf the pieton therein with coneetxent operation of he limiting piunger'fur e acting u. hummer blow upon the nhunk 18 of u tool held in noz' :de l2. ln other words in the neutral position of sleeve ll atmospheric pressure is practically the same nt each undef the 'floatr ing plunger but in'the'operatmg,positionof sleeve il reduction of nir pressure nt the inner end of oating plunger is effected thereby causingthe plunger to reciprimite in harmony therewith. As soon us, the operator exerts pressure upon the handle end 'of the hurl-el; sleeve ll is moved outwiml ezuinst tension of spring 13 so thut port. 8 is c e need thun reducing the aren for the esuq'ie of eir'wh h is b wav of elninuehl 1U und All of slee e li. he lilow imparted to the tool chunk is slight at this time. As the sleeve is pushed further forward the blown ure nrremed in force grmluully as perm 9 and 1 0 are eueceseively closed. Duriugthis.-

utnrtin v operation the plunger extension luis es force.

t-nteret the piston chamber und duringnubmpuent helium-.r blow in carried with the niston both un its inward und outwunl stro es. lfpon the inwuril stroken of the piston n purtiul vnrlnun in maintained in the piston chamber thereby preventing disengagement of the pistou and plunger. l'n this wnnee tion the porta 7' nerve to permit recharging of uir to chamber 7 m4 clearly illustrated in Fig. 2. Such uir cushion han two functions. It i-onlrihutes to the force of the blew without metallic impact between the piston and plunger and prevents the plungerexnsion from impacting against the piston upon its return ntrxilfcgln Fig. 2 the tool purts are shown poeitioned for delivering umaximum blow, portholes H and Il heilig nbsolutely rlosed. lt in nrnnutiinee di'reble Co have the lool deliver lighter hlows. Figs. 3 und 4 illustrate the tool parte positioned for delivering regulated blows of predetermined Spacers of different. widths are en:A

ployouv nrthi purpose, pigs. und 8 illustrating the dctulls of eonstrnrtiou of nlnuf such spacers which nredsubstantizdly U- shaped. The underside of'that portion of nozzle 12 over which bnrrei l? has slidngzengegcment is notched as al 2l to limit the forward movement of the hu'l'rel when tool.

Auml tl of cylinder l are cloned hut ports 10 ure open thereby slightly decreasing the partiul vacuum in c linder 1 in conse( uence of which the .tool ieliverel a lighter li ow.. To positively regulate the tool to deliver n still ighter blow spacer 22' is substituted for spacer 22. With spacer 22' npostion'herrel 17 und control-sleeve 11 are so retarded in their forwnrdmovement that ports 3 are cloned und ports 9 end 10 are open thereby still further decreasing the partial vacuum in cylinder 1 in wnsequence of whichthe tool delivers a still lighter blow.

Whut we claim is 1. ln u tool of theeharaeter stated the comhinntion of a cylinder, cnpable of being shi feed endwise, a nozzle to receive the shank of n tool connected te one end thereof, an eccentric, u iston within the cylinder connect ed to sai: eccentric seid inten being pro'- vided at its outer end wit an air chamber of u depth equal to the throw of seid eccentric uml limiting plunger. dupted to deliver hummer hlows upon the shrink of a tool us held in said nozzle also within the cylinder which plunger is provided with en extension udupted to 'lit within said piston chamber und remain therein during piston strokes there being a vacuum pment between the piston und Yplunger ends und between the end of the plunger extension end the innermost wnll of suid chamber when the piston is moving in one direction.

2. ln a portable tool of the chu'ucllel' stated u ens-lng nn eccentric mounted in said (fusing, nu operutors'humlle nured t0 Said i musing, u cylinder, n piston within the c linder connected with smid eci-nutrie said piston lacing provided with un nir chamber at its unter end of u depth cenni to the throw of seidgceeentric, und :t floating plunger'nlso within seid cylinder said plunger being provided with un extension ndupted to fit within unid piston chamber und remain therein durmg piston strokes.

3. Iln u. tool nf the character stated` un eccentric, u. cylinder1 a piston within the e linder cimnected with seid et :cntrie said piston being provided with un uit chamber ut, its outer end of u depthequui to the throw nf mid eccentric` snid zhnmhcr being provided with ports for recharging said chamber "with air ma n nothing pxup er als@ within with said barrel being provided witlnn plu- -a sleeve end movahle ralitv of air admission'ports-et least some of whie zare constantly in direct commun1ca tion with said grooves.

5.- In i wolof the climatesnm i cyl'- s t inder provided with ports, n piston and plun r operative through said cylinder a no zz e lxed toY seid cyiin over said cylinder for4 olosingmd cuve` order harrelsurroundlng said therewith whichbarrens adn. ted to but againstsidnomlelandining s selected port or rts- .closed during tool operatxon.-

` index' provided with depth being provided with an nir of a said chamber being ,provided'vrith means to .rmit nir to enter said chamber and nlloat mg plnn r also within scid cylinder, seid plunger ing. provided with en extension with a, sin 'ty of sir circule" ps yrcel and n surrounding'said seeve and tixedseid'berrel being provided with l; plu!` tv`- of l'iradmisnionyorts at least constntly 1n communicasome of, hichare tion with slid Bil' 'circula 8. In stool-'ofthe character state n cyl- .indenprovded with pprts,n piston' Ind , piston withif'the er,n'sleeve slidnhle 4be pertain' cable parte .adnphd' for` .insertion ,seid-nozile and' bnnielfonjnnintain equal to the throw of said eccentric,

'e nozzle fixed to said cylin lun er o 'rative thro h said cylinder a riozzfe lxeeto said c linlii: over saidcylinder or closing said. orte in successive order, a barrel surrounding seid sleeve and Fixed thereto which barret-is adapted to abut againstenid nozzle and means adapted forinsertin betweensaid nozzle and arrel for; mninteinin a'selected port or ports permanently open b uringtool operation. I .L 9. In a tool of the charncter stated a cylinder provided with cylinder connected -wjth said eccentric, said pistonv being provided with an air chamber et its outer end ofen depth 'equal to the throw of said eecentri a oatin pluner also within said cylin er seid p unger provided with an extension adapted to fi within said piston r and remain therein during piston strokes,

a sleeve slidable over said cylinder for con.

rts of seid cylinder -said sleeve i Abeing provi ed with a plurality ofexterior trolling the groovestend a barrel surroqndinsnid sleeve ports,' lan eccentric` a and fixed thereto, said barrel being provided with e plurality of air admission portsfnt leest 'some of which are constantly in com muriication with said 10. In a tool of the inder provided with rts, an eccentriqn piston within lthe -hcylmde'r connected' with said eccentric said piston being provided with an air chamber et its outer `end of e depthequal to the throw of said eccentric, n

lllontin plun z also within said cylinder,' said p un er ing provided with en extension lidnp to' fitV within said piston chamber and remain therein dur pistonA strokes,

er, a sleeve .slidable over sind cylm er for closing said ports in successive order, e barrel silrronnding said sleeve and fixed thereto which barrel 1s ada tedto abut against said nozzle end intere angcablc parte adapted for insertion between said nozzle and barrel` for ineim4 ts-inin a selected port or ports permanently open uring tool operation.

In .testimony whereof` wehave hereunto signed our names..

BERT sEAoLnT. HERBERT C. BROWN-f ooves. nrmeter stated, a-cyl-l 

